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Relationships of tumour tissue levels of PNMT mRNA (A and B) or adrenaline (C and D) with NPY mRNA (A and C) or peptide (B and D). (●) Non-syndromic noradrenergic tumours; (■) non-syndromic adrenergic tumours; (○) VHL tumours; (□) MEN 2 tumours.
